Find the approximate mean absolute deviation for this list of numbers. [note: type your answer as a decimal number, rounded to the nearest tenth.]

55, 35, 27, 63, 49, 22, 71

Situation: an archaelogist in turkey discovers a spear head that contains 54% of its original amount of c-14. n = noekt no = inital amount of c-14 (at time t = 0) n = amount of c-14 at time t k = 0.0001 t = time, in years find the age of the spear head to the nearest year